FLV quality looks better than F4V, what am I doing wrong?

Hi,
I exported a small clip as a on2vp6 flv, a h.264 f4v, and a h.264 mp4 file with the adobe media encoder cs4. Each file is the same clip, exported with pretty much the same settings. Resolution: 640x480, 0.5mbps target bit rate, 29.97 fps.
Everything I read says that for a given file and a given bitrate, h.264 should provide better video quality when compared to a h.263 flv file. I would like to know what I am doing wrong, because the h.264 files look worse than the flv file. I have provided download links for a short demo clip in each format.
fl7756n_29_640x480_500kbpsbr.f4v
http://www.filefactory.com/file/af5gc7b/n/fl7756n_29_640x480_500kbpsbr_f4v
fl7756n_29_640x480_500kbpsbr.flv
http://www.filefactory.com/file/af5gc7e/n/fl7756n_29_640x480_500kbpsbr_flv
fl7756n_29_640x480_500kbpsbr.mp4
http://www.filefactory.com/file/af5gc71/n/fl7756n_29_640x480_500kbpsbr_mp4
Why does the clip look better in h.263? It seems that everything I encode at low bitrates looks better in h.263 which leads me to believe I am doing something wrong.

Okay, that is true, they are different codecs. But even adobe says:
Q: How does H.264 compare with the current video formats supported in Flash Player?
A: Flash Player supports the Sorenson Spark video codec (based on H.263) and On2 VP6. H.263 is the predecessor of H.264 and was designed for teleconferencing applications, at 64k rates. H.264 delivers even higher quality at lower bitrates. H.264 will deliver the same or better quality when to compared to the same encoding profile in On2. Factors you should consider when choosing a format include the complexity of the content, the desired reach, ability to archive, and licensing considerations.
at
http://labs.adobe.com/wiki/index.php/Flash_Player:9:Update:H.264#Q:_What_is_H.264.3F
Are there any tricks to getting the h.264 to look "better" than the h.263? Like, the h.264 version of the video doesn't even look close to as good, and I think that the f4v version looks worse than the mp4, which I don't really understand since they are both h.264 files. The footage is from a canon XL2 and the original source is ntsc 720x480. Is there anything special I should be doing for encoding in h.264 instead of h.263. The video is going to be only for the web.

Similar Messages

Please help! I should be getting much better performance! What am I doing wrong?

Hi, there!
I've recently started using After Effects CC and I am getting extremely poor performance, especially given my machine specs (or so I believe).
Everything is very slow, including the actual software interface. Even with the Live Update switched off:
- Moving components on the actual composition view is practically impossible: click, drag, wait about 15seconds, release click and it has moved somewhat in the general direction required, but not even to the place the mouse stopped.
- Scrubbing doesn't work at all, even after the render bar on the timeview is already fully green.
- Standard preview (spacebar) can never play at realtime. The only way to play footage at realtime is to use RAM preview (numpad 0), but even then it takes ages to render small parts (10seconds of footage, takes anywhere between 5 and 10 minutes).
It's enfuriating! I am so convinced that my machine should perform SO much better than this!
I have tried everything that I can think of and everything that I have found on this forum and others through out the internet. Spent the last week googling this issue and have not made much improvement!
I have even checked the raytracker_supported_cards.txt file actually included the GeForce GTX 590. It does.
Any help anyone can provide would be much appreciated, cos I am stumped. Many thanks!
The following are the specs of my pc and the settings of my After Effects (relevant settings and settings I have changed from default):
PC
Components
Comments
Case
Cooler Master HAF X
PSU
Silverstion ST1500 (1500W)
Motherboard
Asus Rampage IV Formula
CPU
Intel Core i7-3960X (6 physical /12 virtual cores) @ 3.3GHz
CPU Cooler
Noctua NH-D14 SE2011
RAM
4x4GB G.Skill Ripjaws
GPUs
2x Zotac Gefore GTX 590 3GB (4 physical GPUs with 1.5GB RAM each)
Latest drivers installed
SSD
Crucial Technology M4 256GB
Used for OS, Applications and AE cache
HD1
Seagate Barracuda 2TB SATAIII 7200RPM
HD2
Western Digital VelociRaptor HDD 10,000RPM
Monitor
Samsung SyncMaster 305T (2560x1600)
OS
Windows 7 Ultimate
All up to date
After Effects
CC
Updated to latest version 12.2.1
After Effects
Preferences Heading
Setting
Set to/
Showing
Comments
General
Allow Scripts to Write Files and Acces Network
Ticked
Don't think this has anything to do with it, but it is something I changed from the default values.
Previews
Adaptive Resolution
1/8
Show Internal Wireframes
Unticked
Zoom Quality
Faster
Color Management Quality
Faster
Previews/GPU Information
Fast Draft
Available
Texture Memory
1115MB
Maximum allowed
Ray-tracing
GPU
OpenGL version
2.1.2
Even though my GPUs (GTX590) are capable of OpenGL 4.4
OpenGL Share Model
3.0
CUDA Driver Version
6.3
CUDA Devices
4
followed by "(GeForce GTX590, GeForce GTX590, GeForce GTX590, GeForce GTX590)"
CUDA Current Usable Memory
1150MB
CUDA Maximum Usable Memory
1500MB
Display
Harware Accelerate Comosition, Layer and Footage Panels
Ticked
Media and Disk Cache
Enable Disk Cache
Ticked
Maximum Disk Cache Size
60GB
Cache Folder
C:\AEcache
Conformed Media Database Folder
C:\AEcache
Conformed Media Cache Folder
C:\AEcache
Write XMP IDs to Files Import
Ticked
Create Layer Markers from Footage XMP Metadata
Ticked
Video Preview
Output Device
None
Auto-save
Automatically Save Projects
Unticked
Memory & Multiprocessing
Installed RAM
16GB
RAM reserved for other applications
6GB
RAM shared by AE
10GB
Reduce cahce size when system is low on memory
Unticked
Render Multiple Frames Simulatenously
Ticked
Only for Render Queue, not for RAM Preview
Unticked
Installed CPUs (processor cores)
12
CPUs Reserved for other applications
6
RAM allocation per background CPU
1.5 GB
Acutal CPUs that will be used
6
Other Options
Pixel Correction
OFF
Fast Preview
Adaptive Resolution
Have played with it in Fast Draft too, but rendering was quicked on Adaptive Resolution.
This is because for A.R. it uses multiprocessing, but for Fast Draft M.P. is disable (incompatible mode, it says).
Renderer
Classic 3D
Thanks again!

Hi, Mylenium,
Thanks for your prompt reply, I'm afraid it hasn't helped. I don't see anything wrong in my device manager.
I have also gone and updated every driver, especially the motherboard chipset and the Sata Intel Rapid Storage Technology driver.
Unfortunately, this hasn't made any difference.
Any other suggestions?
Many thanks in advance!
Hugo

Buttons appearing Mottled.. Looks ugly.. What am I doing wrong?

Hi all,   I've come across an issue with my menus in building a dvd with Encore CS5..   I'm guessing it's something I'm doing wrong and I don't yet know it..
Here's the issue:
I've built all of the menus, no dramas.. Photoshop file is built in 1920 x 1080 dimensions.. No more than 18 links per page as Encore allows.. that's all good..
But the issue is, a lot (most) of the text buttons are coming up with what I'd describe as mottled highlighting colours..
'Selected' buttons show in yellow (I assume this is default as I haven't changed it)
'Clicked/Activated' buttons show in red.. again, I assume this is default..
But yea the problem I'm having does tend to make it a bit ugly..
Is there something I'm doing wrong, and is it an easy fix? (Meaning, please tell me I don't have to build these menus again.. 5 dvds time 6-9 menus each)..
I'm learning as I go with this so it may just be a settings thing which I don't know about, would love to hear from the pros on this one
What I do know is it was shot on a HDV camera 1440 x 1080.. I have had the same issue using 1920 x 1080 footage though so I'm assuming it's not that..
I'm burning onto dual layer dvd due to the size of the project also..    Automatic settings from what I can tell..
Cheers,
Rory O'Donnell

Have just been looking at it... and I'm a little confused..   Sorry, this may get frustrating
This is what I see in Encore with my text as buttons:
And then once I've added the square button (to be) in photoshop, this is what the layers look like in Photoshop:
I've saved the photoshop document, which has then updated in Encore.. I then ticked the boxes to make each button later an actual button, and now I see:
This is where I get lost..   I tried deleting the (=1) layer (under ( + ) Button 1, but then I guess I'm not quite understanding what I'm pasting, where I'm pasting it and so forth.. Whatever I did, it didnt end up with my new button linking to the old text button's location.. )
Again, thanks for your patience on this..
Message was edited by: Rory85

Quick preview looks better than processed raw image...??

Hey all, probably a bit of a "newb" question here... so forgive me, and thank you...
Using a D7000 and often times when I shoot - the preview image on the camera looks BRIGHT, VIVID and ROBUST ... after import however - when reviewing my shots, JUST as I arrow over to the next shot - many of the preview images tend to look better than the processed image that aperture displays once it's done spinning it's wheels.
Perhaps I've messed up a Raw Fine Tuning setting?
When I click on quick preview and browse through an import, the pictures truly look nicer to me than the when aperture processes them.
Without question, the display on my acer monitor is a far cry from the miniature compressed image on the back of my nikon, however the more i shoot, the more I realize a disconnect between what I think I should see, and what I'm ultimately seeing in Aperture.
Are their specific settings to fine tune the import of raw d7000 shots?
Thanks much.. gk

I take it you're shooting and processing RAW images?
It's worth remembering that if you have a picture style selected (i.e. vivid etc), your camera might be applying extra contrast and saturation etc to the image you see on the back of the camera. Camera manufacturers do this so that we can give our pictures some extra punch and colour automatically.
I'd also be wary of comparing what you see on your camera to what you see on your monitor. Unless both are calibrated, you shouldn't trust either of them 100%. The best example of monitor calibration is going to look at TV's in an electronics store. You'll probably notice that in a wall of TV's, some pictures will be darker, some lighter, some more vivid, some more saturated. Using a calibration tool adjusts the picture your screen and monitor displays so that it is 'accurate'.
It's a bit like having a room full of scales and adjusting them so that they all read 1 kilogram when a 1 kilogram weight is placed on each of them. Calibrating monitors will mean that when you display an image on it, it will always look the same rather than getting the some light/some dark problem you saw in the TV store.
It's a tricky subject to explain (don't worry if it doesn't make sense), but you might like to have look around YouTube for videos on the subject.

HT201365 the activation screen(set up screen) for ios 5 and 6 kinda looks better than ios 7 and 8

the activation screen(set up screen) for ios 5 and 6 kinda looks better than ios 7 and 8

So what? Do you want a prize for posting such an illuminating comment?

Why does a DVI or VGA look better than HDMI for 2nd Monitor

Why does a DVI or VGA connection for a program monitor look better than HDMI. I've tested this on several systems with CS5x and CS6. The full screen output from premiere definitely looks worse with HDMI.
I can often see visual differences with the Windows GUI as well, over sharpening of text and lines, harsh rendering of gradients. It looks like a VGA signal displayed on a television.
I've looked at the NVidia stetting and it appears to be set to 1920x1080 at 60hz either way, DVI or HDMI. On one Acer 20 inch monitor the was VGA, HDMI, Composite, Component, and Digital Tuner, but no DVI. The program monitor has always looked blah from the HDMI. So I recently switched the connection to a DVI to VGA adaptor, and now the video looks so much better.
Any thoughts or explanations?

Just because the monitors accept a 1080P signal doesn't mean their native resolution is 1920x1080. At 20 inch they very likely can scale that signal down to the native resolution of the panel which may be 1600 x 900 or another resolution that is 16 x 9 resolution. That scaling can be done by the GPU or firmware on the Monitor depending on the video driver options and the firmware options. That scaling is also the most common cause to text and icon blurriness you are talking about. As an example there are Pro monitors that accept a 4K signal but scale it down to 2.5K or 2K on the actual panel. You might try going into your video card settings such as Nvidia control panel and look for the scaling options. Select GPU scaling and see if the preview is better. If that doesn't work select no scaling and see if it's better if the monitor firmware handles the scaling.
Eric
ADK

What am I doing wrong? flv not found on server!?

I really need some help please!
Here is a step by step of what I've done:
Created a folder on my desktop. Copied .mov to this folder.
Created a new flash file (Actionscript 3.0, CS3). Saved into same
folder on desktop. Used Import Video to import .mov file
(Progressive download, etc). Video imported fine. I tested the
movie and all looks good. So then I published. I checked out the
publish previews and all look good!
So next I took my folder from my dekstop and all it's
contents (.mov, .fla, .flv, .swf, skin.swf, .html, and .js) and
uploaded to my ftp. When I go to the site nothing shows up and it
says there was one error opening the page. So then I looked at the
activity and it says the .flv is not found. But I checked AGAIN and
the .flv is in the same folder as the rest of my files.
Am I missing a step? I am very new to flash and I can't
figure out what I'm doing wrong. Can anyone help? Should I be
posting this in another forum?
Thanks!

Check with your hosting provider to make sure their MIME type
is set to display the FLV format.
Chris Georgenes
Adobe Community Expert
www.mudbubble.com
www.keyframer.com
www.howtocheatinflash.com
Kirsten Vandenhouten wrote:
> I really need some help please!
>
> Here is a step by step of what I've done:
>
> Created a folder on my desktop. Copied .mov to this
folder. Created a new
> flash file (Actionscript 3.0, CS3). Saved into same
folder on desktop. Used
> Import Video to import .mov file (Progressive download,
etc). Video imported
> fine. I tested the movie and all looks good. So then I
published. I checked out
> the publish previews and all look good!
>
> So next I took my folder from my dekstop and all it's
contents (.mov, .fla,
> .flv, .swf, skin.swf, .html, and .js) and uploaded to my
ftp. When I go to the
> site nothing shows up and it says there was one error
opening the page. So then
> I looked at the activity and it says the .flv is not
found. But I checked
> AGAIN and the .flv is in the same folder as the rest of
my files.
>
> Am I missing a step? I am very new to flash and I can't
figure out what I'm
> doing wrong. Can anyone help? Should I be posting this
in another forum?
>
> Thanks!
>

I have a MAC and when i look things up it keeps asking me to install latest adobe flash [layer. I complete installation but it still does not allow me to view. What am I doing wrong?

I have a desktop computer- MAC. When I am looking for information or pulling up games for my grandkids, it will say I need to download the latest version of dobe Flash Player to view. I have downloaded this numerous times yet it still does not allow me to view. What am I doing wrong?

Could be the OS X version is too old for the later recommended Flash player version.
So this is where knowing what your computer really is, and the exact OS X version running in it. There is a hardware limit to upgrading the OS X in a PowerPC Mac with a ceiling of OS X 10.5.8 at the latest. This also limits the upgrade to a later version Adobe Flash player.
If the computer is not an older PPC-based Mac, and instead has an Intel core-duo or core2duo, an upgrade to OS X 10.6.8 is possible through purchase of the retail Snow Leopard 10.6 DVD and after installation, run Software Update to get the 10.6.8 Combo update v1.1 for Snow Leopard. This will not work on a PowerPC based Mac.
Should the computer be able to run a later OS X, a newer Player could be installed.
If the ceiling as suggested above be the case, and the workaround possible.
The question posed by Klaus is a minimal request for basic info.
Good luck
edited

I have a pc and am using the trial version for now. I have readabout and seen on other computers, but no matter where i look or follow the dirrections i can not find the mini bridge what am i doing wrong. thank yo

i have a pc and am using the trial version for now. I have readabout and seen on other computers, but no matter where i look or follow the dirrections i can not find the mini bridge what am i doing wrong. thank you

CC and CC2014 are the current versions of Photoshop. CC stands for Creative Cloud.
That being cleared up, a respectful request:
Topic or subject titles should be clear, pertinent and concise so that individual users can tell at a glance if they can help or not.
That field is not for attempting to fit your entire question in there.
Please keep this in mind next time you post. Thank you.

What am I doing wrong? Text looks BAD

What am I doing wrong here? Created a Motion opening sequence, and exported to movie with Animation as Compressor. Looks GREAT! Then import it into FCP6, and what ever I try, it looks REALLY BAD! I know it probably has to do with the compression I am using, but not sure what to choose! End result is for a DVD.
In iMovieHD(6), I can Export a video directly to iDVD and all looks great. Not sure if this is the problem I am experiencing in FCP? I can't just move it to iMovie, do to the number of cuts/length/video tracks involved, so any suggestions?
Thanks!

Bill,
As was noted in your other thread, video is not simple. If you want simple, stay with iMovie. If you want control, well with great power comes great responsibility. And great responsibility requires continuous study.
DV is one crappy format. It compresses images 5:1 and works in a 4:1:1 color depth. All this means when you go to composite something (.eg text), it will likely look like crud.
One strategy is to increase the color depth in the sequence to 4:2:2. DVCPro50 or ProRes422 DV will do this. These codecs will not improve the original image, but will give a bit more breathing room for color in compositing.
Good luck,
x

Updateing an app..... press update... it swirils, asks password, input password, than it goes back to update. What am I doing wrong?

Updating an app..... Total Domination Reborn
I select the app from the app store.
I select update.
It asks for me to enter my itunes password. I do.
Than it returns showing the update button again.
What am I doing wrong?

Hello Wardhog
Try out the first few steps of closing the app and then restarting your iPad. If it does not work, then you may need to delete the app and then install it again.
iOS: An app you installed unexpectedly quits, stops responding, or won’t open
http://support.apple.com/kb/ts1702
Regards,
-Norm G.

HT5167 I had started to download this about 10hours go-it looks like it's telling me it will take over 2000 hours to doit! It is 1% installed after all this time.What am I doing wrong?

My computer is telling me it will take over 2000hours to download new OSX LIon v10.7.4 update.I had it downloading today for 10 hours and only 1% was done. What am I doing wrong?

You don't say what kind of connection you have, but if it's dial-up, you'll be old and gray before it finishes.

My iPad one won't charge with any cable I buy? Tell me what I am doing wrong.

I have an iPad 1 and have had no major problems with it til now. I want to continue using it, I use it for many things and it would suck if it stoped working because of something IDK about. My first and only apple product.
The charger cable (That came with it) finally broke. The wires just came apart and it wasn't salvagable. I had an Ipod cord here that a friend left and plugged it into the original port (The one that was working fine with original charger and came with ipad). It was a tight squeze into the iPad (which I thought was normal) but I got it into there so I thought it would work. It won't work. So i bought a charger said to be used to ipads, and I plugged it in, same thing happened. I did however still sync it into the computer with the new cable I bought. What am I doing wrong that it won't charge on the wall anymore? Wrong cable? I'm confused. Please help!

Could be the charger, cable or iPad. Plug the USB cable into your computer. It may say "Not Charging", however, it is charging slowly and will verify that the cable is good.
Try this first - Reset the iPad by holding down on the Sleep and Home buttons at the same time for about 10-15 seconds until the Apple Logo appears - ignore the red slider - let go of the buttons. (This is equivalent to rebooting your computer.)
The quickest way (and really the only way) to charge your iPad is with the included 10W or 12W (5W on Mini) USB Power Adapter. iPad will also charge, although more slowly, when attached to a computer with a high-power USB port (many recent Mac computers) or with an iPhone Power Adapter (5W). When attached to a computer via a standard USB port (2.5W, most PCs or older Mac computers) iPad will charge very slowly (but iPad indicates not charging). Make sure your computer is on while charging iPad via USB. If iPad is connected to a computer that’s turned off or is in sleep or standby mode, the iPad battery will continue to drain.
Apple recommends that once a month you let the iPad fully discharge & then recharge to 100%.
How to Calibrate Your Mac, iPhone, or iPad Battery
http://www.macblend.com/how-to-calibrate-your-mac-iphone-or-ipad-battery/
At this link http://www.tomshardware.com/reviews/galaxy-tab-android-tablet,3014-11.html , tests show that the iPad 2 battery (25 watt-hours) will charge to 90% in 3 hours 1 minute. It will charge to 100% in 4 hours 2 minutes. The new iPad has a larger capacity battery (42 watt-hours), so using the 10W charger will obviously take longer. If you are using your iPad while charging, it will take even longer. It's best to turn your new iPad OFF and charge over night. Also look at The iPad's charging challenge explained http://www.macworld.com/article/1150356/ipadcharging.html
Also, if you have a 3rd generation iPad, look at
Apple: iPad Battery Nothing to Get Charged Up About
http://allthingsd.com/20120327/apple-ipad-battery-nothing-to-get-charged-up-abou t/
Apple Explains New iPad's Continued Charging Beyond 100% Battery Level
http://www.macrumors.com/2012/03/27/apple-explains-new-ipads-continued-charging- beyond-100-battery-level/
New iPad Takes Much Longer to Charge Than iPad 2
http://www.iphonehacks.com/2012/03/new-ipad-takes-much-longer-to-charge-than-ipa d-2.html
Apple Batteries - iPad http://www.apple.com/batteries/ipad.html
iPhone: Hardware troubleshooting (Power/Battery section also applies to iPad)
http://support.apple.com/kb/TS2802
Extend iPad Battery Life (Look at pjl123 comment)
https://discussions.apple.com/thread/3921324?tstart=30
iOS 7 Battery Life Draining Too Fast? It’s Easy to Fix
http://osxdaily.com/2013/09/19/ios-7-battery-life-fix/
New iPad Slow to Recharge, Barely Charges During Use
http://www.pcworld.com/article/252326/new_ipad_slow_to_recharge_barely_charges_d uring_use.html
iPad: Charging the battery
http://support.apple.com/kb/HT4060
Best Practices for iPad Battery Charging
http://www.ilounge.com/index.php/articles/comments/best-practices-for-ipad-batte ry-charging/
How to Save and Prolong the battery life of your new ipad
https://discussions.apple.com/thread/4480944?tstart=0
Prolong battery lifespan for iPad / iPad 2 / iPad 3: charging tips
http://thehowto.wikidot.com/prolong-battery-lifespan-for-ipad
iPhone, iPod, Using the iPad Charger
http://support.apple.com/kb/HT4327
Install and use Battery Doctor HD
http://itunes.apple.com/tw/app/battery-doctor-hd/id459702901?mt=8
To Extend a Device’s Battery Life, Get to Know It Better
http://tinyurl.com/b67c7xz
iPad Battery Replacement
http://www.apple.com/batteries/replacements.html
In rare instances when using the Camera Connection Kit, you may notice that iPad does not charge after using the Camera Connection Kit. Disconnecting and reconnecting the iPad from the charger will resolve this issue.
 Cheers, Tom

What am I doing wrong with this filter (counter/frequency issue), probably another newb question.

I extracted the part of my VI that applies here. I have a 6602 DAQ board reading a counter for frequency, using a Cherry Corp proximity sensor. Getting a lot of noise and errant ridiculously high readings. Speed of shaft which it's measuring is currently 2400rpm with one pulse per revolution so 40hz.
Trying to use the express filter VI to clean up the signal and ignore anything over, say, 45hz and under 35hz. No matter what setting I choose I continually get the 20020 error, Analysis: The cut-off frequency, fc, must meet: 0 <= fc <= fs/2. I know this relates to sample period somehow, but for the life of me I can't understand what I'm doing wrong.
I used this VI without filtering on bench tests with a hand-drill and got perfect output every time. Now it's on the machine and being erratic. Any help here will ease my stress level significantly, thanks.
VI attached
Still confused after 8 years.
Attachments:
RPM.vi ‏92 KB

Hello Ralph,
I'm not sure about mounting your sensor to your rig, but I can provide a couple ideas about the filtering. Depending on the type of noise, the digital filters on the PCI-6602 could help eliminate the behavior you are seeing. If the noise manifests as a "glitches" or a bouncing signal, you could use another counter with a minimum period to help eliminate the noise. This concept is discussed in greater detail in this KnowledgeBase. I noticed that you are using NI-DAQmx; the practical application of the digital filters on the PCI-6602 in NI-DAQmx is discussed in this KnowledgeBase. A more detailed description of the behavior of these filters is provided in the NI-DAQmx Help (Start>>All Programs>>National Instruments>>NI-DAQ) in the book entitled "Digital Filtering Considerations for TIO-Based Devices".
I also wanted to comment on your original post and explain why you were receiving error -20020. For convenience, I have copied the text of the error code below.
Error -20020 occurred at an unidentified location
Possible reason(s):
Analysis: The cut-off frequency, fc, must meet: 0 <= fc <= fs/2.
I think you may have misunderstood exactly what the Filter express VI does. The Filter express VI takes a series of values in a waveform and performs filtering on those signals. So, it will look at a waveform made up of X and Y values and apply the defined filter to this waveform. Specifically in your application, the cut-off frequency (fc) is the Upper Cut-Off level that you specified in the Filter express VI; any frequency components of the waveform outside of the range you have defined will be filtered. The fs is the sample rate based on the data that you wire to the Signal input of the Filter express VI. In your VI, this data is coming from the DAQ Assistant. So, fs will be the sample rate of the DAQ Assistant and is associated with the rate at which points are acquired. The sample rate does NOT relate to the bandwidth of the signal, except that the Nyquist theorem tells us that the sample rate must be at least twice the signal bandwidth in order to determine periodicity of the signal. So, in this case, the sample rate of the DAQ Assistant would need to be at least double the high cut-off frequency.
However, you are performing a frequency measurement using a counter. I think this is where the confusion comes in. For the frequency measurement using a counter, the DAQ Assistant returns a decimal value which represents the rate of the pulse train being measured by the counter. It does not return the actual waveform that is being read by the counter. It is this waveform that would be band-pass filtered to eliminate frequency content outside of the filter's bandwidth. Instead of the Filter express VI, I would recommend that you simply discard values that are outside the range you specify. I have modified the code you posted earlier to perform this operation. The image below shows the changes that I made; rather than using the Filter express VI, I simply compare the frequency to the "Low Threshold" and "High Threshold". I use a Case structure to display the value on if it is within the limits. Otherwise, I display a "NaN" value. I have also attached the modified VI to this post.
Message Edited by Matt A on 09-04-2007 07:58 PM
Matt Anderson
Hardware Services Marketing Manager
National Instruments
Attachments:
RPM (Modified).JPG ‏17 KB
RPM (modified).vi ‏72 KB

Can't get iTunes to sync from hp laptop to iPod shuffle. What am I doing wrong?

I have iTunes on an HP laptop and I can't get songs moved from iTunes to the shuffle. If I open the shuffle on the laptop, it seems the songs are on it, but if I go to listen to the new music, they're not there. Can't figure out what I'm doing wrong. Help.

Hey there web300!
You are looking in the right place for all that information! You do need to be completely logged on (at the top right) in order to see all the values.
If you are not getting the best signal, you can also change the security type under Wifi settings and Security. Various types can work better with certain computers. Do not make it an open network however.
What zip code are you in that this is happening? Is it only indoors? Let us know and we can take a look on the network side.
Thanks!
MichelleG_VZW
Please follow us on Twitter @vzwsupport

FLV quality looks better than F4V, what am I doing wrong?

Similar Messages

Maybe you are looking for